Originally Posted by dirtydog

You can't close the radiator cap until the engine is fully warm and circulating. The circulating moves the air bubble out of the cap. With your truck cold, remove the radiator cap until it gets fully warm (20-30 minutes at idle). Top off as level drops. Once warm, shut your engine down and let fully cool. If your coolant tank is near empty, then put the cap back on the radiator before the engine cools because it will push fluid out of the radiator and into the expansion tank. I would leave the cap off the expansion tank the entire time. it's really simple.
Just make sure you have coolant in the upper radiator hose. if not, you'll have to unhook it and pour coolant into the hose while it's removed and then re-attach.

Originally Posted by Another ram 5.7 guy

So I have a few questions for my 2010 ram.. yesterday I drained the coolant and refilled it and now my rad fan isn't kicking in could that be becus it might have air pockets somewhere?

Originally Posted by Alex Medeiros

Did you open up the bleeder valve? If it has coolant bubbling when it's opened, then that means air is still inside the system.